CN201583768U - High-frequency ultra-short light pulse generating device based on nonlinear fibers - Google Patents
High-frequency ultra-short light pulse generating device based on nonlinear fibers Download PDFInfo
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- CN201583768U CN201583768U CN2009202208649U CN200920220864U CN201583768U CN 201583768 U CN201583768 U CN 201583768U CN 2009202208649 U CN2009202208649 U CN 2009202208649U CN 200920220864 U CN200920220864 U CN 200920220864U CN 201583768 U CN201583768 U CN 201583768U
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Abstract
A high-frequency ultra-short light pulse generating device based on nonlinear fibers is characterized in that the high-frequency ultra-short light pulse generating device is formed by a device on the basis of modulating an unstable ultra-high repeated frequency light pulse and comprises a double-frequency beating light source, a high-power fiber amplifier and nonlinear fibers, an output end of the double-frequency beating light source is connected with the high-power fiber amplifier, an output end of the high-power fiber amplifier is connected with the nonlinear fibers, and output ends of the nonlinear fibers output high-frequency ultra-short pulse sequences. The high-frequency ultra-short light pulse generating device has the advantages that 1, the high-frequency pulse generating device aiming to technical shortcomings of generating high-frequency pulses via unstable modulation realizes generating high-frequency pulses by utilizing the nonlinear fibers with high nonlinear factors and high stimulated Brillouin scattering threshold, 2, the high-frequency ultra-short light pulse generating device does not need to be provided with an electrooptical modulator, and 3, the device is simple in structure, easy in operation method, low in cost and convenient in popularization.
Description
(1) technical field:
The utility model relates to the optical pulse instrument, and is particularly a kind of based on the controlled high frequency of highly nonlinear optical fiber generation repetition frequency, the device of ultrashort light pulse.
(2) background technology:
In recent years, the optical fiber communication fast development, people are also more and more higher to the demand of network capacity.Will further improve the capacity of Networks of Fiber Communications, except utilizing multiplexing means such as wavelength-division multiplex (WDM) or Time Division Multiplexing, the transfer rate that improves single channel also is to improve the effective ways of network capacity.(＞high-quality ultrashort light pulse 40GHz) becomes an important research direction of raising optical communication system transfer rate to the research and development high repetition frequency.
Up to the present, realize that the main method of high repetition frequency ultrashort light pulse has: utilize initiatively or laser with active-passive lock mould generation ultrashort light pulse sequence, utilize modulational instability that beat frequency coherent source shaping compression is realized high repetition frequency light pulse sequence etc.Obtain the light pulse of repetition frequency, just need avoid using the device of rate-constrained system as far as possible, as electrooptic modulator etc. greater than 40GHz.Nonlinear effect is very fast owing to its response speed, and is not subjected to the restriction of electrooptic modulator, becomes a kind of very effective method that produces the high repetition frequency light pulse.Therefore utilize the method for the ultrashort light pulse that modulational instability produces to have the superiority that other method institute can not compare, as be easy to obtain repetition frequency above 40GHz.
An obvious characteristic of modulational instability is that on time domain, quasi c. w. is changed into periodic pulse train.Small sample perturbations on the time domain finally can be converted into the light pulse of high repetition frequency.In the world, modulational instability is applied to the generation of ultrashort light pulse very early.Wherein, the disturbance that utilizes double frequency beat frequency light wave to form on the initial time domain becomes the research focus.The repetition frequency of the high repetition frequency light pulse sequence that double frequency beat frequency light wave produces is identical with the frequency interval of beat frequency light wave, is easy to obtain big beat frequency at interval by two the continuous light waves that are coupled.For example, obtain the light pulse of the high repetition frequency of 1THz, corresponding beat frequency is spaced apart 1THz, and it can obtain by two laser instruments that coupled wavelength is spaced apart 8nm, and this is easy to realize at optical field.Modulational instability is the nonlinear effect in the nonlinear medium and the result of chromatic dispersion combined action, utilizes different nonlinear medium (different nonlinear factors and chromatic dispersion) can obtain the light pulse of different high repetition frequencies.For example, double frequency beat frequency light wave can be produced the 32GHz light pulse sequence by a nonlinear fiber loop mirror (NFLM), it can be produced 59.1GHz optical soliton pulse train by one section optical fiber with pectination dispersion profile, it can be produced 114GHz optical soliton pulse train by one section chromatic dispersion optical fiber (DDF) that successively decreases, with its optical fiber, can produce the light pulse sequence of 160GHz by one section chromatic dispersion particular design.But obtain the optical fiber of chromatic dispersion special distribution and be not easy, use conventional fiber (nonlinear optical fiber that promptly has constant chromatic dispersion) also can obtain the light pulse of high repetition frequency.As utilize standard single-mode fiber can obtain the light pulse sequence of the high repetition frequency of 20GHz, 80GHz; Utilize the dispersion flattene highly nonlinear optical fiber can obtain 320GHz, 640GHz, even the light pulse sequence of the high repetition frequency of 1THz.
But, in order to suppress the stimulated Brillouin scattering in the optical fiber, the live width that needs an electrooptic modulator to come broadening double frequency beat frequency light wave usually, thereby the threshold value of raising stimulated Brillouin scattering.Because the threshold value of stimulated Brillouin scattering (SBS) is relevant with the live width of incoming signal.The introducing of phase-modulator has increased the complexity of structure, has improved cost.
(3) summary of the invention:
The purpose of this utility model is to provide a kind of generation device of the high frequency ultrashort light pulse based on nonlinear optical fiber, it has mainly utilized the high non-linearity effect and the effect of dispersion of nonlinear optical fiber, convert the double frequency beat signal to high repetition frequency ultrashort light pulse sequence by highly nonlinear optical fiber, be that a kind of device is simple, signal transforms the optical pulse equipment easily of realizing.
The technical solution of the utility model: a kind of generation device of the high frequency ultrashort light pulse based on nonlinear optical fiber, it is characterized in that it is made of the device based on the superelevation repetition frequency light pulse of modulational instability, comprise: double frequency beat frequency light source, high-power fiber amplifier and nonlinear optical fiber, the output terminal of double frequency beat frequency light source links to each other with high-power fiber amplifier, the output terminal of high-power fiber amplifier connects nonlinear optical fiber, the output terminal output high frequency ultrashort light pulse sequence of nonlinear optical fiber.
Above-mentioned said double frequency beat frequency light source has two kinds of frame modes, and a mode is to connect Polarization Controller by a laser instrument, is parallel to coupling mechanism with another laser instrument more afterwards, and the output terminal of coupling mechanism connects high-power fiber amplifier; Another way is for directly to connect high-power fiber amplifier by dual laser.
The coupling mechanism of above-mentioned said dual-laser device in parallel adopts three-dB coupler, promptly 50: 50 coupling mechanism.
Above-mentioned said high-power fiber amplifier can be selected Erbium-Doped Fiber Amplifier (EDFA) or erbium-ytterbium co-doped fiber amplifier.
Above-mentioned said nonlinear optical fiber adopts dispersion shifted optical fiber, ignore the highly nonlinear optical fiber of loss, ignore loss non-linear photon crystal optical fiber, consider that (photonic crystal fiber of loss factor α=0.2dB/km) comprises bismuthate glass optical fiber (bismuth fiber), sulfide optical fiber or other highly nonlinear optical fibers in loss.
Principle of work of the present utility model is: utilize modulational instability (chromatic dispersion and nonlinear acting in conjunction) that the beat frequency coherent source is carried out the shaping compression, make beat frequency coherent source through nonlinear optical fiber, produce and the identical light pulse sequence of beat frequency light source repetition frequency with same magnitude.By the wavelength interval of regulating dual laser the repetition frequency of output optical pulse sequence is regulated.The output of the high repetition frequency light pulse that the method realizes has very strong dirigibility, can realize the output of different repetition frequency light pulses.Non-linear Schrodinger equation below the process that develops of light wave transmitting in whole nonlinear optical fiber satisfies:
Superiority of the present utility model and beneficial effect are: 1, produce the technological deficiency of high frequency light pulse at existing modulational instability, proposed to use nonlinear factor height, nonlinear optical fiber that the stimulated Brillouin scattering threshold value is high to realize the device that high-frequency impulse produces; 2, because the stimulated Brillouin scattering threshold value of this nonlinear optical fiber is higher, in the generation device of high frequency ultrashort light pulse sequence, need not to dispose electrooptic modulator, this method reduces the cost of system greatly, realize the generation of cost-effective high frequency light pulse, solved the superelevation speed light source problem of following superelevation speed optical fiber telecommunications system; 3, apparatus structure is simple, the method easy operating, and cost is low, is convenient to promote.
(4) description of drawings:
Accompanying drawing 1 is the generation device theory diagram of the related a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of the utility model.
Accompanying drawing 2 is embodiment 1 structural representation of the generation device of the related a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of the utility model.
Accompanying drawing 3 is embodiment 2 structural representations of the generation device of the related a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of the utility model.
Accompanying drawing 4 is embodiment 3 structural representations of the generation device of the related a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of the utility model.
Accompanying drawing 5 is embodiment 4 structural representations of the generation device of the related a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of the utility model.
Wherein: 1 is laser instrument, 2 is laser instrument, 3 is dual laser, and 4 is Polarization Controller, and 5 is three-dB coupler, 6 is Erbium-Doped Fiber Amplifier (EDFA) (EDFA), 7 for ignoring the dispersion shifted optical fiber of loss, and 8 for ignoring the highly nonlinear optical fiber of loss, and 9 is erbium-ytterbium co-doped fiber amplifier, 10 for ignoring the photonic crystal fiber of loss, and 11 is the photonic crystal fiber of loss factor α=0.2dB/km.
(5) embodiment:
Embodiment: a kind of generation device (seeing Fig. 1 and Fig. 2-5) of the high frequency ultrashort light pulse based on nonlinear optical fiber, it is characterized in that it is made of the device based on the superelevation repetition frequency light pulse of modulational instability, comprise: double frequency beat frequency light source, high-power fiber amplifier and nonlinear optical fiber, the output terminal of double frequency beat frequency light source links to each other with high-power fiber amplifier, the output terminal of high-power fiber amplifier connects nonlinear optical fiber, the output terminal output high frequency ultrashort light pulse sequence of nonlinear optical fiber.
Above-mentioned said double frequency beat frequency light source has two kinds of frame modes, and a mode (see figure 2) is to connect Polarization Controller 4 by a laser instrument 1, is parallel to coupling mechanism 5 with another laser instrument 2 more afterwards, and the output terminal of coupling mechanism 5 connects high-power fiber amplifier; The another way (see figure 3) is directly to connect high-power fiber amplifier by dual laser 3.
The coupling mechanism 5 of above-mentioned said dual-laser device in parallel (1 and 2) adopts three-dB coupler, promptly 50: 50 coupling mechanism.
Above-mentioned said high-power fiber amplifier can be selected Erbium-Doped Fiber Amplifier (EDFA) 6 (seeing Fig. 2,3) or erbium-ytterbium co-doped fiber amplifier 9 (seeing Fig. 4,5).
Above-mentioned said nonlinear optical fiber adopts dispersion shifted optical fiber 7 (see figure 2)s, ignore highly nonlinear optical fiber 8 (see figure 3)s of loss, ignore non-linear photon crystal optical fiber 10 (see figure 4)s of loss or consider loss (photonic crystal fiber 11 (see figure 5)s of loss factor α=0.2dB/km).
Table 1 is the summary to the foregoing description, and P is the output power of amplifier, and L is a fiber lengths, and f is the repetition frequency of output pulse sequence, and Δ t is the pulse width of output pulse sequence.Table 1
| Fiber type | β 2 ps 2/km | γ (w -1km -1) | P (mW) | L (m) | f (GHz) | Δt (fs) | Embodiment |
| Dispersion shifted optical fiber | 0.48 | 1.7 | 50.6 | 13369 | 100 | 1560 | |
| Highly nonlinear optical fiber | 0.97 | 10.5 | 83.7 | 1671 | 200 | 781 | |
| The photonic crystal fiber of ignoring loss | 0.48 | 11 | 195.5 | 534.7 | 500 | 312 | |
| The photonic crystal fiber of not ignoring loss | 0.48 | 11 | 195.5 | 534.7 | 500 | 330.1 | Embodiment 4 is as accompanying |
Sum up, this case is to utilize the chromatic dispersion of nonlinear optical fiber and high non-linearity effect, by the effect of modulational instability to beat signal, produce the generation device of the repetition frequency high frequency ultrashort light pulse sequence identical with the initial input beat frequency rate, and this apparatus structure is simple, cost is low, therefore is convenient to promote.
Claims (5)
1. generation device based on the high frequency ultrashort light pulse of nonlinear optical fiber, it is characterized in that it is made of the device based on the superelevation repetition frequency light pulse of modulational instability, comprise: double frequency beat frequency light source, high-power fiber amplifier and nonlinear optical fiber, the output terminal of double frequency beat frequency light source links to each other with high-power fiber amplifier, the output terminal of high-power fiber amplifier connects nonlinear optical fiber, the output terminal output high frequency ultrashort light pulse sequence of nonlinear optical fiber.
2. according to the generation device of the said a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of claim 1, it is characterized in that said double frequency beat frequency light source has two kinds of frame modes, one mode is to connect Polarization Controller by a laser instrument, be parallel to coupling mechanism with another laser instrument more afterwards, the output terminal of coupling mechanism connects high-power fiber amplifier; Another way is for directly to connect high-power fiber amplifier by dual laser.
3. according to the generation device of the said a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of claim 2, it is characterized in that the coupling mechanism of said dual-laser device in parallel adopts three-dB coupler, promptly 50: 50 coupling mechanism.
4. according to the generation device of the said a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of claim 1, it is characterized in that said high-power fiber amplifier selects Erbium-Doped Fiber Amplifier (EDFA) or erbium-ytterbium co-doped fiber amplifier.
5. according to the generation device of the said a kind of high frequency ultrashort light pulse based on nonlinear optical fiber of claim 1, it is characterized in that said nonlinear optical fiber adopt dispersion shifted optical fiber, ignore loss highly nonlinear optical fiber, ignore loss non-linear photon crystal optical fiber, consider the photonic crystal fiber of loss; Above-mentioned optical fiber comprises bismuthate glass optical fiber and sulfide optical fiber.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713901B (en) * | 2009-09-25 | 2012-03-07 | 天津理工大学 | Nonlinear fiber based generating device of high-frequency ultrashort optical pulse and working method thereof |
| CN102393593A (en) * | 2011-06-30 | 2012-03-28 | 北京邮电大学 | Ultra-short pulse light source generating device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713901B (en) * | 2009-09-25 | 2012-03-07 | 天津理工大学 | Nonlinear fiber based generating device of high-frequency ultrashort optical pulse and working method thereof |
| CN102393593A (en) * | 2011-06-30 | 2012-03-28 | 北京邮电大学 | Ultra-short pulse light source generating device |
| CN102393593B (en) * | 2011-06-30 | 2013-08-07 | 北京邮电大学 | Ultra-short pulse light source generating device |
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